windows-azure-storage.php

<?php
/**
 * Plugin Name:       Microsoft Azure Storage for WordPress
 * Plugin URI:        https://wordpress.org/plugins/windows-azure-storage/
 * Description:       Use the Microsoft Azure Storage service to host your website's media files.
 * Version:           4.5.1
 * Requires at least: 6.4
 * Requires PHP:      8.0
 * Author:            10up, Microsoft Open Technologies
 * Author URI:        https://10up.com/
 * License:           BSD 2-Clause
 * License URI:       http://www.opensource.org/licenses/bsd-license.php
 * Text Domain:       windows-azure-storage
 * Domain Path:       /languages
 */

/*
 * Copyright (c) 2009-2016, Microsoft Open Technologies, Inc.
 * Copyright (c) 2016, 10up
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions  and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A  PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * PHP Version 5
 *
 * @category  WordPress_Plugin
 * @package   Windows_Azure_Storage_For_WordPress
 * @author    Microsoft Open Technologies, Inc. <msopentech@microsoft.com>
 * @copyright Microsoft Open Technologies, Inc.
 * @license   New BSD license, (http://www.opensource.org/licenses/bsd-license.php)
 * @link      http://www.microsoft.com
 */

/*
 * 'Microsoft Azure SDK for PHP v0.4.0' and its dependencies are included
 * in the library directory. If another version of the SDK is installed
 * and USESDKINSTALLEDGLOBALLY is defined, that version will be used instead.
 * 'Microsoft Azure SDK for PHP' provides access to the Microsoft Azure
 * Blob Storage service that this plugin enables for WordPress.
 * See https://github.com/windowsazure/azure-sdk-for-php/ for updates to the SDK.
 */

define( 'MSFT_AZURE_PLUGIN_PATH', plugin_dir_path( __FILE__ ) );
define( 'MSFT_AZURE_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
define( 'MSFT_AZURE_PLUGIN_LEGACY_MEDIA_URL', get_admin_url( get_current_blog_id(), 'media-upload.php' ) );
define( 'MSFT_AZURE_PLUGIN_VERSION', '4.5.1' );

/**
 * Get the minimum version of PHP required by this plugin.
 *
 * @return string Minimum version required.
 */
function was_minimum_php_requirement() {
	return '8.0';
}

/**
 * Checks whether PHP installation meets the minimum requirements
 *
 * @return bool True if meets minimum requirements, false otherwise.
 */
function was_site_meets_php_requirements() {

	return version_compare( phpversion(), was_minimum_php_requirement(), '>=' );
}

if ( ! was_site_meets_php_requirements() ) {
	add_action(
		'admin_notices',
		function() {
			?>
			<div class="notice notice-error">
				<p>
					<?php
					echo wp_kses_post(
						sprintf(
							/* translators: %s: Minimum required PHP version */
							__( 'Microsoft Azure Storage for WordPress requires PHP version %s or later. Please upgrade PHP or disable the plugin.', 'windows-azure-storage' ),
							esc_html( was_minimum_php_requirement() )
						)
					);
					?>
				</p>
			</div>
			<?php
		}
	);
	return;
}

require_once MSFT_AZURE_PLUGIN_PATH . 'windows-azure-storage-settings.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'windows-azure-storage-dialog.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'windows-azure-storage-util.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-rest-api-client.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-generic-list-response.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-list-containers-response.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-list-blobs-response.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-config-provider.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-filesystem-access-provider.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-file-contents-provider.php';
require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';
require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-direct.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-wp-filesystem-direct.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-helper.php';
require_once MSFT_AZURE_PLUGIN_PATH . 'includes/class-windows-azure-replace-media.php';

if ( defined( 'WP_CLI' ) && WP_CLI ) {
	require_once MSFT_AZURE_PLUGIN_PATH . 'bin/wp-cli.php';
	require_once MSFT_AZURE_PLUGIN_PATH . 'includes/compat.php';
}

require_once MSFT_AZURE_PLUGIN_PATH . 'vendor/autoload.php';

// Check prerequisite for plugin.
register_activation_hook( __FILE__, 'windows_azure_plugin_check_prerequisite' );

add_action( 'plugins_loaded', 'windows_azure_storage_load_textdomain' );
add_action( 'admin_menu', 'windows_azure_storage_plugin_menu' );
add_filter( 'media_buttons', 'windows_azure_storage_media_buttons' );
add_action( 'load-settings_page_windows-azure-storage-plugin-options', 'windows_azure_storage_load_settings_page' );
add_action( 'load-settings_page_windows-azure-storage-plugin-options', 'windows_azure_storage_check_container_access_policy' );
add_action( 'wp_ajax_query-azure-attachments', 'windows_azure_storage_query_azure_attachments' );
add_action( 'wp_ajax_delete-azure-blob', 'windows_azure_storage_delete_blob' );
add_action( 'wp_ajax_get-azure-progress', 'windows_azure_upload_progress' );

/**
 * Add Azure-specific tabs to the editor's media loader.
 *
 * @since    Unknown
 * @internal Callback for 'media_upload_tabs'.
 *
 * @param array $tabs Array of existing tabs.
 *
 * @return array Filtered array of tabs with our additions.
 */
function azure_storage_media_menu( $tabs ) {
	$tabs['browse'] = __( 'Browse Azure Storage', 'windows-azure-storage' );

	return $tabs;
}

// Hook for adding tabs.
add_filter( 'media_upload_tabs', 'azure_storage_media_menu' );

// Add callback for three tabs in the Microsoft Azure Storage Dialog.
add_action( 'media_upload_browse', 'windows_azure_browse_tab' );

// Hooks for handling default file uploads.
if ( Windows_Azure_Helper::get_use_for_default_upload() ) {
	add_filter( 'wp_generate_attachment_metadata', 'windows_azure_storage_wp_generate_attachment_metadata', 10, 2 );

	if ( Windows_Azure_Helper::delete_local_file() ) {
		add_filter( 'wp_generate_attachment_metadata', 'windows_azure_storage_delete_local_files', 10, 2 );
	}

	// Hook for handling blog posts via xmlrpc. This is not full proof check.
	add_filter( 'content_save_pre', 'windows_azure_storage_content_save_pre' );

	add_filter( 'wp_handle_upload_prefilter', 'windows_azure_storage_wp_handle_upload_prefilter' );

	// Hook for handling media uploads.
	add_filter( 'wp_handle_upload', 'windows_azure_storage_wp_handle_upload' );

	// Filter to modify file name when XML-RPC is used.
	add_filter( 'xmlrpc_methods', 'windows_azure_storage_xmlrpc_methods' );
}

// Hook for acecssing attachment (media file) URL.
add_filter( 'wp_get_attachment_url', 'windows_azure_storage_wp_get_attachment_url', 9, 2 );

// Hook for acecssing metadata about attachment (media file).
add_filter( 'wp_get_attachment_metadata', 'windows_azure_storage_wp_get_attachment_metadata', 9, 2 );

// Hook for handling deleting media files from standard WordpRess dialog.
add_action( 'delete_attachment', 'windows_azure_storage_delete_attachment' );

// Filter the 'srcset' attribute in 'the_content' introduced in WP 4.4.
if ( function_exists( 'wp_calculate_image_srcset' ) ) {
	add_filter( 'wp_calculate_image_srcset', 'windows_azure_storage_wp_calculate_image_srcset', 9, 5 );
	add_filter( 'wp_calculate_image_srcset_meta', 'windows_azure_storage_image_srcset_meta', 9, 4 );
}

// Load media replace module
new Windows_Azure_Replace_Media();

/**
 * Loads text domain.
 *
 * @since 4.0.3
 */
function windows_azure_storage_load_textdomain() {
	load_plugin_textdomain( 'windows-azure-storage', false, basename( dirname( __FILE__ ) ) . '/languages' );
}

/**
 * Check prerequisite for the plugin and report error
 *
 * @return void
 */
function windows_azure_plugin_check_prerequisite() {
	global $wp_version;
	if ( ! was_site_meets_php_requirements() ) {
		deactivate_plugins( plugin_basename( __FILE__ ) );
		wp_die( __( 'Microsoft Azure Storage for WordPress requires at least PHP ' . was_minimum_php_requirement(), 'windows-azure-storage' ) );
	}
	$wp_compat = version_compare( $wp_version, '5.7', '>=' );
	if ( ! $wp_compat ) {
		deactivate_plugins( plugin_basename( __FILE__ ) );
		wp_die( __( 'Microsoft Azure Storage for WordPress requires at least WordPress 5.7', 'windows-azure-storage' ) );
	}
}

/**
 * Replacing the callback for XML-RPC metaWeblog.newMediaObject
 *
 * @param array $methods XML-RPC methods.
 *
 * @return array $methods Modified XML-RPC methods
 */
function windows_azure_storage_xmlrpc_methods( $methods ) {
	$methods['metaWeblog.newMediaObject'] = 'windows_azure_storage_new_media_object';

	return $methods;
}

/**
 * Upload a file
 * Added unique blob name to the WordPress core mw_newMediaObject method
 *
 * @param array $args Method parameters.
 *
 * @return array
 */
function windows_azure_storage_new_media_object( $args ) {
	global $wpdb, $wp_xmlrpc_server;

	$blog_id  = (int) $args[0];
	$username = $wp_xmlrpc_server->escape( $args[1] );
	$password = $wp_xmlrpc_server->escape( $args[2] );
	$data     = $args[3];

	$name = sanitize_file_name( $data['name'] );
	$type = $data['type'];
	$bits = $data['bits'];

	if ( ! $user = $wp_xmlrpc_server->login( $username, $password ) ) {
		return $wp_xmlrpc_server->error;
	}

	/** This action is documented in wp-includes/class-wp-xmlrpc-server.php */
	do_action( 'xmlrpc_call', 'metaWeblog.newMediaObject' );

	if ( ! current_user_can( 'upload_files' ) ) {
		$wp_xmlrpc_server->error = new IXR_Error( 401, __( 'You do not have permission to upload files.', 'windows-azure-storage' ) );

		return $wp_xmlrpc_server->error;
	}

	/**
	 * Filter whether to preempt the XML-RPC media upload.
	 *
	 * Passing a truthy value will effectively short-circuit the media upload,
	 * returning that value as a 500 error instead.
	 *
	 * @since 2.1.0
	 *
	 * @param bool $error Whether to pre-empt the media upload. Default false.
	 */
	if ( $upload_err = apply_filters( 'pre_upload_error', false ) ) {
		return new IXR_Error( 500, $upload_err );
	}

	if ( ! empty( $data['overwrite'] ) && ( true === $data['overwrite'] ) ) {
		// Get postmeta info on the object.
		$old_file = $wpdb->get_row(
			$wpdb->prepare( 'SELECT ID FROM %s WHERE post_title = %s  AND post_type = %s LIMIT 1', $wpdb->posts, $name, 'attachment' )
		);

		// If query isn't successful, bail.
		if ( is_null( $old_file ) ) {
			return new WP_Error( -1, sprintf(
				__( 'Attachment not found in %s', 'windows-azure-storage' ),
				esc_html( $name )
			), $wpdb->print_error( $old_file ) );
		}

		// Delete previous file.
		wp_delete_attachment( $old_file->ID );

		// Make sure the new name is different by pre-pending the
		// previous post id.
		$filename = preg_replace( '/^wpid\d+-/', '', $name );
		$name     = "wpid{$old_file->ID}-{$filename}";
	}

	// default azure storage container.
	$container = \Windows_Azure_Helper::get_default_container();

	$upload_dir = \Windows_Azure_Helper::wp_upload_dir();
	if ( DIRECTORY_SEPARATOR === $upload_dir['subdir'][0] ) {
		$upload_dir['subdir'] = substr( $upload_dir['subdir'], 1 );
	}

	// Prepare blob name.
	$blob_name = ( '' === $upload_dir['subdir'] ) ? $name : $upload_dir['subdir'] . '/' . $name;

	$blob_name = \Windows_Azure_Helper::get_unique_blob_name( $container, $blob_name );

	$name = basename( $blob_name );

	$upload = wp_upload_bits( $name, null, $bits );
	if ( ! empty( $upload['error'] ) ) {
		$error_string = sprintf( __( 'Could not write file %1$s (%2$s)', 'windows-azure-storage' ), $name, $upload['error'] );

		return new IXR_Error( 500, $error_string );
	}
	// Construct the attachment array.
	$post_id = 0;
	if ( ! empty( $data['post_id'] ) ) {
		$post_id = (int) $data['post_id'];

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return new IXR_Error( 401, __( 'Sorry, you cannot edit this post.', 'windows-azure-storage' ) );
		}
	}
	$attachment = array(
		'post_title'     => $name,
		'post_content'   => '',
		'post_type'      => 'attachment',
		'post_parent'    => $post_id,
		'post_mime_type' => $type,
		'guid'           => $upload['url'],
	);

	// Save the data.
	$id = wp_insert_attachment( $attachment, $upload['file'], $post_id );
	wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $upload['file'] ) );

	/**
	 * Fires after a new attachment has been added via the XML-RPC MovableType API.
	 *
	 * @since 3.4.0
	 *
	 * @param int   $id   ID of the new attachment.
	 * @param array $args An array of arguments to add the attachment.
	 */
	do_action( 'xmlrpc_call_success_mw_newMediaObject', $id, $args );

	$struct = array(
		'id'   => strval( $id ),
		'file' => $upload['file'],
		'url'  => $upload['url'],
		'type' => $type,
	);

	/** This filter is documented in wp-admin/includes/file.php */
	return apply_filters( 'wp_handle_upload', $struct, 'upload' );
}

/**
 * Wordpress hook for wp_get_attachment_url
 *
 * @param string  $url     Post url.
 *
 * @param integer $post_id Post id.
 *
 * @return string Returns metadata url.
 */
function windows_azure_storage_wp_get_attachment_url( $url, $post_id ) {
	$media_info = get_post_meta( $post_id, 'windows_azure_storage_info', true );

	if ( ! empty( $media_info ) && isset( $media_info['url'] ) ) {
		return $media_info['url'];
	} else {
		return $url;
	}
}

/**
 * Wordpress hook for wp_get_attachment_metadata. Cache mediainfo for
 * further reference.
 *
 * @param string  $data    Attachment data.
 *
 * @param integer $post_id Associated post id.
 *
 * @return array Return input data without modification.
 */
function windows_azure_storage_wp_get_attachment_metadata( $data, $post_id ) {
	if ( is_numeric( $post_id ) ) {
		// Cache this metadata. Needed for deleting files.
		$media_info = get_post_meta( $post_id, 'windows_azure_storage_info', true );
	}

	return $data;
}

/**
 * Offload assets to Azure Blob Storage via wp_generate_attachment_metadata hook
 *
 * @param string  $data    Attachment data.
 * @param integer $post_id Attachment post id.
 *
 * @return array data after updating information about blob storage URL and tags.
 */
function windows_azure_storage_wp_generate_attachment_metadata( $data, $post_id ) {
	$default_azure_storage_account_container_name = \Windows_Azure_Helper::get_default_container();

	$post = get_post( wp_get_post_parent_id( $post_id ) );
	$time = null;
	if ( $post ) {
		// The post date doesn't usually matter for pages, so don't backdate this upload.
		if ( 'page' !== $post->post_type && substr( $post->post_date, 0, 4 ) > 0 ) {
			$time = $post->post_date;
		}
	}

	// Get upload directory.
	$upload_dir = \Windows_Azure_Helper::wp_upload_dir( $time );

	$upload_file_name = get_post_meta( $post_id, '_wp_attached_file', true );

	// get path info for uploaded file.
	$upload_file_path_info = pathinfo( $upload_file_name );

	// Prepare blob name.
	$upload_path = trailingslashit( ltrim( $upload_dir['reldir'], '/' ) );
	$file_path = ltrim( $upload_path, '/' ) . $upload_file_name;

	// Upload path for remaining files.
	$upload_folder_path = trailingslashit(
		sprintf(
			'%s%s',
			trailingslashit( ltrim( $upload_dir['reldir'], '/' ) ),
			ltrim( ( ! empty( $upload_file_path_info['dirname'] ) ? $upload_file_path_info['dirname'] : '' ), '/' )
		)
	);

	// Check if yearmonth_folders is checked
	$user_filemonth_folders = get_option( 'uploads_use_yearmonth_folders' );
	if ( empty( $user_filemonth_folders ) ) {
		$upload_folder_path = '/';
	}

	try {
		$post_array = wp_unslash( $_POST );
		$post_array = wp_parse_args( $post_array, array(
			 'item_id' => $post_array['name'] . '_' . $post_array['_wpnonce'],
		) );
		$azure_progress_key = 'azure_progress_' . sanitize_text_field( trim( $post_array['item_id'] ) );
		$current            = 0;
		// Get full file path of uploaded file.
		$data['file'] = $upload_file_name;

		// Get mime-type of the file.
		$mime_type = get_post_mime_type( $post_id );
		$total = 1;
		if ( ! empty( $data['sizes'] ) ) {
			$total = count( $data['sizes'] ) + 1;
		}
		if ( ! empty( $data['original_image'] ) ) {
			$total++;
		}

		try {
			set_transient( $azure_progress_key, array( 'current' => ++$current, 'total' => $total ), 5 * MINUTE_IN_SECONDS );

			// only upload file if file exists locally
			if ( \Windows_Azure_Helper::file_exists( $file_path ) ) {
				\Windows_Azure_Helper::put_media_to_blob_storage(
					$default_azure_storage_account_container_name,
					$file_path,
					$file_path,
					$mime_type
				);
			}
		} catch ( Exception $e ) {
			echo '<p>', sprintf( __( 'Error in uploading file. Error: %s', 'windows-azure-storage' ), esc_html( $e->getMessage() ) ), '</p>';

			return $data;
		}

		$url = sprintf( '%1$s/%2$s',
			untrailingslashit( WindowsAzureStorageUtil::get_storage_url_base() ),
			$file_path
		);

		// Set new url in returned data.
		$data['url'] = $url;

		// Handle thumbnail and image sub-size files.
		$thumbnails = array();
		if ( ! empty( $data['sizes'] ) ) {
			foreach ( $data['sizes'] as $size ) {
				// Move only if file exists. Some theme may use same file name for multiple sizes.
				$thumbnail_file_path = $upload_folder_path . $size['file'];
				if ( Windows_Azure_Helper::file_exists( $thumbnail_file_path ) ) {
					$blob_name = ltrim( $thumbnail_file_path, '/' );

					set_transient(
						$azure_progress_key,
						array( 'current' => ++$current, 'total' => $total ),
						5 * MINUTE_IN_SECONDS
					);

					// Ensure PDF thumbnails are offloaded with JPEG mimetype instead of PDF
					if ( 'application/pdf' === $mime_type ) {
						$mime_type = 'image/jpeg';
					}

					\Windows_Azure_Helper::put_media_to_blob_storage(
						$default_azure_storage_account_container_name,
						$blob_name,
						$blob_name,
						$mime_type
					);

					$thumbnails[] = $blob_name;
				}
			}
		}

		// Handle original_image if scaled due to WP 5.3+ Big Image threshold
		if ( ! empty( $data['original_image'] ) ) {
			$original_image_path = $upload_folder_path . $data['original_image'];

			// Move only if original_image file exists
			if ( Windows_Azure_Helper::file_exists( $original_image_path ) ) {
				$blob_name = ltrim( $original_image_path, '/' );

				set_transient(
					$azure_progress_key,
					array( 'current' => ++$current, 'total' => $total ),
					5 * MINUTE_IN_SECONDS
				);

				\Windows_Azure_Helper::put_media_to_blob_storage(
					$default_azure_storage_account_container_name,
					$blob_name,
					$blob_name,
					$mime_type
				);

				// Add original_image to thumbnails array to allow deletion later if needed
				$thumbnails[] = $blob_name;
			}
		}

		delete_post_meta( $post_id, 'windows_azure_storage_info' );

		add_post_meta( $post_id, 'windows_azure_storage_info', array(
			'container'  => $default_azure_storage_account_container_name,
			'blob'       => $file_path,
			'url'        => $url,
			'thumbnails' => $thumbnails,
			'version'    => MSFT_AZURE_PLUGIN_VERSION,
		) );

	} catch ( Exception $e ) {
		echo '<p>', sprintf( __( 'Error in uploading file. Error: %s', 'windows-azure-storage' ), esc_html( $e->getMessage() ) ), '</p>';
	}

	return $data;
}

/**
 * Delete local images after successfully offloading to Azure
 *
 * @param $data
 * @param $attachment_id
 *
 * @return mixed
 */
function windows_azure_storage_delete_local_files( $data, $attachment_id ) {
	$upload_file_name = get_attached_file( $attachment_id, true );

	// Use core function introduced in 4.9.7 for deleting local files if available
	if ( function_exists( 'wp_delete_attachment_files') ) {
		$deleted = wp_delete_attachment_files( $attachment_id, $data, array(), $upload_file_name );

		if ( true === $deleted ) {
			return $data;
		}
	}

	// Get upload directory.
	$upload_dir = Windows_Azure_Helper::wp_upload_dir();
	$subdir = ltrim( $upload_dir['reldir'] . $upload_dir['subdir'], DIRECTORY_SEPARATOR );

	$relative_file_name = DIRECTORY_SEPARATOR === $subdir
		? basename( $upload_file_name )
		: str_replace( $upload_dir['uploads'] . DIRECTORY_SEPARATOR, '', $upload_file_name );

	// Delete local file
	Windows_Azure_Helper::unlink_file( $relative_file_name );

	$file_upload_dir = strpos( $relative_file_name, '/' ) !== false
		? substr( $relative_file_name, 0, strrpos( $relative_file_name, '/' ) )
		: '';

	// Delete local sub-sizes
	if ( ! empty ( $data['sizes'] ) ) {
		foreach ( $data['sizes'] as $size ) {
			// Delete the local thumbnail file.
			Windows_Azure_Helper::unlink_file( trailingslashit( $file_upload_dir ) . $size['file'] );
		}
	}

	// Delete original image if scaled due WP 5.3 Big Image threshold
	if ( ! empty( $data['original_image'] ) ) {
		 Windows_Azure_Helper::unlink_file( trailingslashit( $file_upload_dir ) . $data['original_image'] );
	}

	return $data;
}

/**
 * Hook for updating post content prior to saving it in the database.
 *
 * @param string $text Post content.
 *
 * @return string Updated post content.
 */
function windows_azure_storage_content_save_pre( $text ) {
	return get_updated_upload_url( $text );
}

/**
 * Hook for altering the file name.
 * Check whether the blob exists in the container and generate a unique file name for the blob.
 *
 * @param array $file An array of data for a single file.
 *
 * @return array Updated file data.
 */
function windows_azure_storage_wp_handle_upload_prefilter( $file ) {
	// default azure storage container.
	$container = \Windows_Azure_Helper::get_default_container();

	$upload_dir = \Windows_Azure_Helper::wp_upload_dir();
	$subdir = ltrim( $upload_dir['reldir'] . $upload_dir['subdir'], DIRECTORY_SEPARATOR );

	// Prepare blob name.
	$blob_name = '' === $subdir
		? $file['name']
		: $subdir . DIRECTORY_SEPARATOR . $file['name'];

	$blob_name = \Windows_Azure_Helper::get_unique_blob_name( $container, $blob_name );

	$file['name'] = basename( $blob_name );

	return $file;
}

/**
 * Hook for handling media uploads.
 *
 * @param array $uploads Upload metadata.
 *
 * @return array Updated metadata.
 */
function windows_azure_storage_wp_handle_upload( $uploads ) {
	$wp_upload_dir  = \Windows_Azure_Helper::wp_upload_dir();

	$uploads['url'] = sprintf(
		'%1$s/%2$s/%3$s',
		untrailingslashit( WindowsAzureStorageUtil::get_storage_url_base() ),
		ltrim( $wp_upload_dir['reldir'] . $wp_upload_dir['subdir'], '/' ),
		basename( $uploads['file'] )
	);

	return $uploads;
}

/**
 * Common function to replace wordpress file uplaod url with
 * Microsoft Azure Storage URLs
 *
 * @param string $url Original upload URL.
 *
 * @return string Updated upload URL.
 */
function get_updated_upload_url( $url ) {
	$wp_upload_dir      = \Windows_Azure_Helper::wp_upload_dir();
	$upload_dir_url     = untrailingslashit( $wp_upload_dir['baseurl'] );
	$storage_url_prefix = untrailingslashit( WindowsAzureStorageUtil::get_storage_url_base() ) . untrailingslashit( $wp_upload_dir['reldir'] );

	return str_replace( $upload_dir_url, $storage_url_prefix, $url );
}

/**
 * Hook for handling deleting media files from standard WordpRess dialog.
 *
 * @param string $post_id Post id.
 *
 * @return void
 */
function windows_azure_storage_delete_attachment( $post_id ) {
	if ( is_numeric( $post_id ) ) {
		$media_info = get_post_meta( $post_id, 'windows_azure_storage_info', true );

		if ( ! empty( $media_info ) ) {
			// Delete media file from blob storage.
			$container_name = $media_info['container'];
			$blob_name      = $media_info['blob'];
			\Windows_Azure_Helper::delete_blob( $container_name, $blob_name );

			// Delete associated thumbnails from blob storage (if any).
			$thumbnails = $media_info['thumbnails'];
			if ( ! empty( $thumbnails ) ) {
				foreach ( $thumbnails as $thumbnail_blob ) {
					\Windows_Azure_Helper::delete_blob( $container_name, $thumbnail_blob );
				}
			}
		}
	}
}

/**
 * Add Browse tab to the popup windows.
 *
 * @return void
 */
function windows_azure_browse_tab() {
	/** @var $path_parsed array Parsed path. */
	$path_parsed = parse_url( self_admin_url() );
	$path_parsed = isset( $path_parsed['path'] ) ? $path_parsed['path'] : null;
	$js_ext      = ( ! defined( 'SCRIPT_DEBUG' ) || false === SCRIPT_DEBUG ) ? '.min.js' : '.js';
	add_action( 'admin_enqueue_scripts', 'windows_azure_storage_dialog_scripts' );
	wp_enqueue_media();
	wp_enqueue_script( 'media-grid' );
	wp_enqueue_script( 'windows-azure-storage-media-browser', MSFT_AZURE_PLUGIN_URL . 'js/windows-azure-storage-media-browser' . $js_ext, array( 'media-grid' ), MSFT_AZURE_PLUGIN_VERSION );
	wp_localize_script( 'media-grid', '_wpMediaGridSettings', array(
		'adminUrl' => $path_parsed,
		'l10n'     => array(
			'selectText' => __( 'Insert into post', 'windows-azure-storage' ),
		),
	) );
	wp_iframe( 'windows_azure_storage_dialog_browse_tab' );
}

/**
 * Output contents for Media Library Azure Browse iframe based tab.
 *
 * @since 4.0.0
 *
 * @return void
 */
function windows_azure_storage_dialog_browse_tab() {
	?>
	<div id="windows-azure-storage-browser"></div>
	<?php
	wp_print_media_templates();
}

/**
 * Hook for adding new toolbar button in edit post page.
 *
 * @since    1.0.0
 * @since    3.0.0 Rewrote internals to only create a single element.
 * @internal Callback for 'media_buttons' filter.
 *
 * @return string Media buttons context with our button appended.
 */
function windows_azure_storage_media_buttons( $context ) {
	global $post_ID, $temp_ID;

	$uploading_iframe_id = (int) ( 0 === $post_ID ? $temp_ID : $post_ID );

	$browse_iframe_src = apply_filters( 'browse_iframe_src',
		add_query_arg(
			array(
				'tab'       => 'browse',
				'post_id'   => $uploading_iframe_id,
				'TB_iframe' => 'true',
				'height'    => 500,
				'width'     => 640,
			),
			MSFT_AZURE_PLUGIN_LEGACY_MEDIA_URL
		)
	);

	$azure_image_button_element = sprintf(
		'<a id="windows-azure-storage-media-button" role="button" href="javascript:void(0)" class="button" data-editor="content"
title="%2$s"><img src="%3$s" alt="%2$s" role="img" class="windows-azure-storage-media-icon" />%4$s</a>',
		esc_url( $browse_iframe_src ),
		esc_attr__( 'Microsoft Azure Storage', 'windows-azure-storage' ),
		esc_url( MSFT_AZURE_PLUGIN_URL . 'images/azure-icon.png' ),
		esc_html__( 'Add Media From Azure', 'windows-azure-storage' )
	);

	echo wp_kses( $azure_image_button_element, array(
		'a'   => [
			'id'          => 'windows-azure-storage-media-button',
			'role'        => 'button',
			'href'        => 'javascript:void(0)',
			'class'       => 'button',
			'data-editor' => 'content',
			'title'       => true,
		],
		'img' => [
			'src'   => true,
			'alt'   => true,
			'role'  => 'img',
			'class' => 'windows-azure-storage-media-icon',
		]
	) );
}

/**
 * Add option page for Microsoft Azure Storage Plugin.
 *
 * @return void
 */
function windows_azure_storage_plugin_menu() {
	if ( current_user_can( 'manage_options' ) ) {
		add_options_page(
			__( 'Microsoft Azure Storage Plugin Settings', 'windows-azure-storage' ),
			__( 'Microsoft Azure', 'windows-azure-storage' ),
			'manage_options',
			'windows-azure-storage-plugin-options',
			'windows_azure_storage_plugin_options_page'
		);
	}

	// Call register settings function.
	add_action( 'admin_init', 'windows_azure_storage_plugin_register_settings' );
}

/**
 * Filter the image source URLs to point 'srcset' to Azure Storage blobs.
 *
 * @since    3.0.0
 * @internal Callback for 'wp_calculate_image_srcset' filter.
 * @see      wp_calculate_image_srcset()
 * @link     http://projectnami.org/fix-for-azure-storage-plugin-and-wp-4-4/
 *
 * @param array  $sources       {
 *                              One or more arrays of source data to include in the 'srcset'.
 *
 * @type array   $width         {
 * @type string  $url           The URL of an image source.
 * @type string  $descriptor    The descriptor type used in the image candidate string,
 *                                    either 'w' or 'x'.
 * @type int     $value         The source width if paired with a 'w' descriptor, or a
 *                                    pixel density value if paired with an 'x' descriptor.
 *      }
 * }
 *
 * @param array  $size_array    Array of width and height values in pixels (in that order).
 * @param string $image_src     The 'src' of the image.
 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id Image attachment ID or 0.
 *
 * @return array The filtered $sources array.
 */
function windows_azure_storage_wp_calculate_image_srcset( $sources, $size_array, $image_src, $image_meta, $attachment_id ) {
	$media_info                                   = get_post_meta( $attachment_id, 'windows_azure_storage_info', true );
	$default_azure_storage_account_container_name = \Windows_Azure_Helper::get_default_container();
	$azure_storage_override_container_path        = \Windows_Azure_Helper::get_azure_storage_override_container_path();
	$maybe_override_container_path                = ! empty( $azure_storage_override_container_path ) ? $azure_storage_override_container_path : $default_azure_storage_account_container_name;

	// If a CNAME is configured, make sure only 'http' is used for the protocol.
	$azure_cname       = \Windows_Azure_Helper::get_cname();
	$esc_url_protocols = ! empty( $azure_cname ) ? array( 'https', 'http', '//' ) : null;

	if ( ! empty( $media_info ) ) {
		$base_url = trailingslashit( WindowsAzureStorageUtil::get_storage_url_base( false ) . $maybe_override_container_path );

		foreach ( $sources as &$source ) {
			$img_filename = substr( $source['url'], strrpos( $source['url'], '/' ) + 1 );

			if ( basename( $media_info['blob'] ) === $img_filename ) {
				$source['url'] = esc_url( $base_url . $media_info['blob'], $esc_url_protocols );
			} else {
				foreach ( $media_info['thumbnails'] as $thumbnail ) {
					if ( basename( $thumbnail ) === $img_filename ) {
						$source['url'] = esc_url( $base_url . $thumbnail, $esc_url_protocols );
						break;
					}
				}
			}
		}
	}

	return $sources;
}

/**
 * Removes "sites/{id}" from filename for attachments uploaded before 4.2.0 to provide backward compatibility.
 *
 * @since 4.2.0
 * @filter wp_calculate_image_srcset_meta
 *
 * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param array $size_array Array of width and height values in pixels (in that order).
 * @param string $image_src The 'src' of the image.
 * @param int $attachment_id The image attachment ID or 0 if not supplied.
 * @return type
 */
function windows_azure_storage_image_srcset_meta( $image_meta, $size_array, $image_src, $attachment_id ) {
	if ( is_multisite() && ! empty( $image_meta ) && ! empty( $image_meta['file'] ) ) {
		$info = get_post_meta( $attachment_id, 'windows_azure_storage_info', true );
		if ( empty( $info['version'] ) || version_compare( $info['version'], '4.2.0', '<' ) ) {
			$image_meta['file'] = preg_replace( '/sites\/[0-9]+\//', '', $image_meta['file'] );
		}
	}

	return $image_meta;
}

/**
 * Handle ajax request for querying Azure Blobs.
 *
 * @since 4.0.0
 *
 * @return void
 */
function windows_azure_storage_query_azure_attachments() {
	if ( ! current_user_can( 'upload_files' ) ) {
		wp_send_json_error();
	}

	$cache_ttl = Windows_Azure_Helper::get_cache_ttl();
	$request   = wp_unslash( $_REQUEST );
	$query     = isset( $request['query'] ) ? (array) $request['query'] : array();
	$query     = array_intersect_key( $query, array_flip( array(
		's',
		'posts_per_page',
		'paged',
	) ) );

	$query = wp_parse_args( $query, array(
		's'              => '',
		'posts_per_page' => Windows_Azure_Rest_Api_Client::API_REQUEST_BULK_SIZE,
		'paged'          => 1,
	) );

	$next_marker = 1 === (int) $query['paged'] || empty( $_COOKIE['azure_next_marker'] )
		? false
		: sanitize_text_field( wp_unslash( $_COOKIE['azure_next_marker'] ) );

	$cache_key = 'wasr_' . md5( json_encode( $query ) );
	if ( $cache_ttl > 0 && $posts = wp_cache_get( $cache_key ) ) {
		wp_send_json_success( $posts );

		return;
	}
	$posts       = array();
	$credentials = Windows_Azure_Config_Provider::get_account_credentials();
	$client      = new Windows_Azure_Rest_Api_Client( $credentials['account_name'], $credentials['account_key'] );
	$blobs       = $client->list_blobs( Windows_Azure_Helper::get_default_container(), $query['s'], (int) $query['posts_per_page'], $next_marker );
	setcookie( 'azure_next_marker', $blobs->get_next_marker() );
	foreach ( $blobs as $blob ) {
		$blob_name       = $blob->getName();
		$blob_properties = $blob->getProperties();
		if ( '/' === $blob_name[ strlen( $blob_name ) - 1 ] ) {
			continue;
		}

		$is_image = ( false !== strpos( $blob_properties->getContentType(), 'image/' ) );

		$blob_info = array(
			'id'                    => base64_encode( $blob_name ),
			'uploading'             => false,
			'filename'              => $blob_name,
			'dateFormatted'         => Windows_Azure_Helper::get_formatted_date_for_blob( $blob_properties ),
			'icon'                  => $is_image ? Windows_Azure_Helper::get_full_blob_url( $blob_name ) : wp_mime_type_icon( $blob_properties->getContentType() ),
			'url'                   => Windows_Azure_Helper::get_full_blob_url( $blob_name ),
			'filesizeHumanReadable' => size_format( $blob_properties->getContentLength() ),
			'isImage'               => $is_image,
		);

		if ( current_user_can( 'delete_posts' ) ) {
			$blob_info['nonces']['delete'] = wp_create_nonce( 'delete-blob_' . $blob_info['id'] );
		}

		$posts[] = $blob_info;
	}
	if ( $cache_ttl > 0 ) {
		wp_cache_set( $cache_key, $posts, '', $cache_ttl );
	}
	wp_send_json_success( $posts );
}

/**
 * Handle delete-blob ajax request.
 *
 * @since 4.0.0
 *
 * @return void
 */
function windows_azure_storage_delete_blob() {
	$post_array = wp_unslash( $_POST );
	$id         = isset( $post_array['id'] ) ? $post_array['id'] : 0;

	if ( ! check_ajax_referer( "delete-blob_$id", false, false ) ) {
		wp_die( -1 );
	}
	if ( ! current_user_can( 'delete_posts' ) ) {
		wp_die( -1 );
	}

	$remote_path = base64_decode( $id );

	if ( ! $remote_path ) {
		wp_die( -1 );
	}

	$credentials = Windows_Azure_Config_Provider::get_account_credentials();
	$client      = new Windows_Azure_Rest_Api_Client( $credentials['account_name'], $credentials['account_key'] );
	$result      = $client->delete_blob( Windows_Azure_Helper::get_default_container(), $remote_path );
	if ( is_wp_error( $result ) || ! $result ) {
		wp_die( 0 );
	} else {
		wp_die( 1 );
	}
}

/**
 * Handle ajax requests for Azure upload progress.
 *
 * @since 4.0.0
 *
 * @return void
 */
function windows_azure_upload_progress() {
	$post_array = wp_unslash( $_POST );
	$item_id    = isset( $post_array['data']['item_id'] ) ? sanitize_text_field( $post_array['data']['item_id'] ) : false;
	$item_id    = trim( $item_id );
	if ( ! $item_id ) {
		wp_send_json_success( array(
			'progress' => 100,
			'current'  => -1,
			'total'    => -1,
		) );
	}

	$progress = get_transient( 'azure_progress_' . $item_id );
	if ( ! $progress ) {
		wp_send_json_success( array(
			'progress' => -1,
			'current'  => -1,
			'total'    => -1,
		) );
	} else {
		wp_send_json_success( array(
			'progress' => (int) ( $progress['current'] * 100 / $progress['total'] ),
			'current'  => $progress['current'],
			'total'    => $progress['total'],
		) );
	}

}

/**
 * Add admin notice if no direct filesystem access
 *
 * @since 4.0.1
 */
function windows_azure_no_filesystem_access_notice() {
	if ( ! WP_Filesystem() ) {
		?>
		<div class="notice notice-error">
			<p>
				<?php esc_html_e( 'Microsoft Azure Storage requires direct filesystem access in order to work.', 'windows-azure-storage' ) ?>
			</p>
		</div>
		<?php
	}
}

add_action( 'admin_notices', 'windows_azure_no_filesystem_access_notice' );